That depends on the center angle coming from that arc. If it is 90 degrees, multiply the arc by 4, etc.
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the fraction of the circle covered by the arc
-80
The angle measure is: 90.01 degrees
The entire circumference has a central angle of 360 degrees. The arc is a fraction of the circumference. The fraction is (central angle) divided by (360). So the arc length is: (circumference) x (central angle) / (360) .
To find the arc length, you also need to know the radius (or diameter) of the arc. The arc length is then found by finding the circumference of the full circle (2xPIxradius) and then dividing by 4 to find just one quarter of the circle (90 degrees).